Junction-box.



PATENTED DEC. 12, 1905. E. T. GREENFIBLD. JUNCTION BOX.

nrmcumx mum 1.23. 1904.

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WITNESSES:

' disks the inner walls of the cover or that porjectionable features ofmy before-mentioned and the same will be fully understood by relowing isa specification.

mentioned patent is composed of a castbase of said box is provided withsimilar semicirthe same, taken on the linoX X, Fig. 1, and

UNITED sTAnEs V EDWIN T. GREEXFIELD, OF

MONTICELLO, NEW' YORK.

JUNCTION-BOX.

Specification of Letters Patent.

Patented Dec. 12, 1905.

Application filed January 23. 1904. S i N 3 To all {1-71 moz'fi nmyconcern:

Be it known that I, EDWIN T. GREENFIELD, a citizen of the United States,residing at Monticello. in the countyof Sullivan and State of New York,have made a new and useful Invention in Junction-Boxes, of which thefol- My invention is directed particularly to an improvement upon ajunction-box for electrical conductors disclosed in a prior patentgranted tome on the 30th da vof-, anu2ry-, 900, by the United StatesPatent Oiiice and bearing No. (H2521. The box disclosed in thebeforehaving semicircular openings for receiving the inner ends ofcondu1ts, and the 11d or cover cular openings, in the inner faces ofwhich are cast integral with the box elliptical disks adapted when thetwo parts of the box are put together to completely close all of theopenings, the arrangement being such that these elliptical disks may bebroken out by a tool, as desired, when the junction-box is put in place.It is-found in practice in the use of such boxes that oftentimes inbreaking out the tion with which the disks are integral are chipped outor broken away, thereby causing said walls to have a thickness atthepoint or points where the conduit tube or tubes enter the same less thanthe thickness of the wall of the box proper, and often, in fact,breaking down the inner wall of the box so as to leave an opening atthat point, thus making the same worthless, so that it has to be thrownaway.

The tire underwriters in many cities require that the walls ofelectrical junctionboxes shall be as nearly the same thickness aspossible throughout and that the boxes when in use shall be withoutholes or openings; and it was with the object of overcoming the obboxthat the present invention was devised,

fcrring to the accompanying drawings, in which Figure 1 is a plan viewof a two-part castmetal box with a part of the lid or cover broken away.Fig. 2 is a sectional view of as seen looking thereat from'left to rightin the direction of the arrows, my improvement being shown in bothviews. Fig. 3 is a plan view of a ceiling switch-box as seen lookinginto the interior thereof, the cover being re moved, two of the disksbeing broken out and the other two being in normal position, and anopening provided in the center of the base 0 1' the box for a gas-pipeor hanger. Fig. 4 is: sectional view taken through Fig. 3 on the line YY and as seen looking thereat from the top toward the bottom of thedrawings in the direction of the arrows, the junction-boxes illustratedin the drawings being of usual form, except that they. embody myimprovement, as will now be described.

Referring first o Figs. 1 and 2, B represents the base, and A the cover,of a two-part. junction-box having on one side three hollow half-necks EE E and on the opposite side a single hollow half-neck E for theadmission of a gas-pipe. E E being similar hollow halfnecks to E E forthe admission of armored conduits. Gand G are lugs on oppositesides ofthe base for centering the cover or lid in its correct position, and S Sare screws for securing the bottom of the box to its proper support. Thelid or cover is provided with similar half-necks, as shown, and at theinner end of each of the several half-necks is cast integral with itscorresponding part hall'- disks D, overlapping each other and located ina plane or planes parallel with the inner face of the box and as shownin Fig. 2. The inner portion of the half-necks are undercut between themand the disks, as shown at K K, so as to make it possible on inserting atool in the corresponding neck to break away said half-disk withoutinjuring or impairing in any way the inner wall of the box. hen the twoparts of the box are put together as ordinarily cast, therefore, therewill be no access to theinterior thereof. However, when it becomesnecessary to use it the semicylindrical disks are driven inward by atool in the same manner that the elliptical disks are driven inward inthe junction-box disclosed in my prior patent, it being apparent that byreason of the undercut nature of the necks in Figs. 1 and 2 and thcone-shaped extensions thereof, as shown in Fig. 4:, there can by nopossibility be effected a breaking away of the surface of the bus whichwould make the walls thereof any thinner than before said disks werebroken away.

In Figs. 3 and 4 is shown a ceiling junctionbox provided with lugs orcars F F F F for securing it by screws 5 directly to the ceiling, Mbeing a gas-pipe or hanger opening in the center of-said box. In thisform of the in Ioo Q v Gonzo-2 vention complete circular disks D D arecast l integral at the outer ends of cone shaped necks N N on theoutside of the box and ina 5 plane or planes parallel with the basethereof, as clearly shown, and when said disks are broken away by a toolinserted within the box the necks will have the smooth inner surfacesand even edges, as illustrated in Fig. 4, without diminishing thethickness of the walls of the box or in any way injuring or impairingthe same.

Having thus described my invention, what Iclaim, and desire to secure byLetters Patent of the United States, is

1. Ajunction-box having a series of inlead- 5 ing necks and a series ofclosing-disks therc- Q for east integral with the walls of the box andin planes parallel therewith, the thickness of said disks being less ineach instance than F that of the corresponding wall of the box.

2. A junction-box having one or more hollow inleading necks castintegral therewith and closing-disks therefor cast integral with thenecks, the construction being such that l g i [aid disks may be brokendown or removed without injuring or impairing the structure.

3. A junction-box having an inleading neck and a disk at one end thereofcast integral with the box, said disk being in a. plane parallel withthe wall of the box and so constructed that it may be broken awaywithout injuring or impairing the structure.

4. A junction-box having an inleading neck and a closing-disk thereforboth cast integral with the box, said disk being located in a planeparallel with the inner wall of the box and the inner end of the neckundercut between it and the disk, whereby the latter may be removed oninserting a tool without injuring or impairing the wall of the box.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

EDWIN T. GREEN FIELD W'itnesses:

V31. T. RUETE, M. F. KEATING.

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